{"title":"A Broadband Spectrum Channelizer with PWM-LO Based Sub-Band Equalization","authors":"Ki Yong Kim, Heechai Kang, V. Singh, R. Gharpurey","doi":"10.1109/DCAS.2018.8620186","DOIUrl":null,"url":null,"abstract":"A spectrum channelizer that employs a frequency-folded analog-to-digital converter (FF-ADC) is described. The design allows for downconversion and channelization of a broadband spectrum into contiguous sub-bands, by using polyphase downconversion, baseband analog-to-digital conversion, and sub-band separation through digital-domain harmonic rejection. The sub-bands are aliased at baseband in the polyphase paths. At baseband, the sub-bands with large signal power can reduce the effective ADC dynamic range available for those with lower power levels. An approach that employs pulse-width-modulated local oscillator (PWM-LO) waveforms in the polyphase paths, for equalizing the sub-bands at baseband, prior to digitization, is proposed to address this issue. The approach makes it possible to vary the spectral response of the FF-ADC with low signal-path complexity.","PeriodicalId":320317,"journal":{"name":"2018 IEEE 13th Dallas Circuits and Systems Conference (DCAS)","volume":"179 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2018 IEEE 13th Dallas Circuits and Systems Conference (DCAS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/DCAS.2018.8620186","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
A spectrum channelizer that employs a frequency-folded analog-to-digital converter (FF-ADC) is described. The design allows for downconversion and channelization of a broadband spectrum into contiguous sub-bands, by using polyphase downconversion, baseband analog-to-digital conversion, and sub-band separation through digital-domain harmonic rejection. The sub-bands are aliased at baseband in the polyphase paths. At baseband, the sub-bands with large signal power can reduce the effective ADC dynamic range available for those with lower power levels. An approach that employs pulse-width-modulated local oscillator (PWM-LO) waveforms in the polyphase paths, for equalizing the sub-bands at baseband, prior to digitization, is proposed to address this issue. The approach makes it possible to vary the spectral response of the FF-ADC with low signal-path complexity.